The Master Tactician is the fourteenth chapter of the Crimson Flower route of Fire Emblem: Three Houses.
With Myrddin under Imperial control, Adrestia turns its attention to the Alliance capital of Derdriu. Edelgard elaborates that Claude has kept the Empire out by acting as an intermediary between the pro-Empire and pro-Church factions of the Alliance and keeping them in a state of balanced power so that none may act against each other. Hubert explains that Claude has placed Derdriu on lockdown. As House Riegan is the center of the pro-Church faction of the Alliance, taking Derdriu will topple the pro-Church faction and bring the Alliance fully to Adrestia's side.
The week of the invasion of Derdriu, Edelgard recounts the story of the 10 Elites and the Relics. She explains that the Relics were created by mankind, only to be collected by Seiros after she manipulated the people of the world and killed the Liberation King Nemesis. According to her, the age-old claim that Nemesis was corrupted by his power is a lie and that the true conflict was a relatively mundane dispute that erupted into war. After defeating Nemesis, the Immaculate One and her family then took control of Fódlan with the aid of Edelgard's distant ancestor, the first emperor of Adrestia. Meanwhile, Claude and the Almyran general Nader lament the current state of affairs and the incoming battle with the Empire. The Imperial forces engage Claude in battle, and emerge victorious; Nader is driven off, Derdriu is brought under Imperial control, and Claude is spared or executed at the player's discretion. If Claude is spared, he approaches Byleth and Edelgard to explain he is leaving Fódlan. He asks Edelgard to show mercy to the Alliance and his former classmates and reveals that he has arranged for control of Alliance territory and resources to transfer to Edelgard. If Claude is killed, Edelgard theorizes that he arranged the battle so that the war between Adrestia and Leicester would come to an end with a minimal amount of bloodshed no matter the outcome. Either way, the Empire celebrates their victory and returns to the monastery to prepare for battle against Faerghus.
If Lysithea was not recruited beforehand, she will appear as an enemy here. Defeating her will give a prompt whether to persuade or kill her. Choosing to spare Lysithea will result in her joining at the end of the chapter.
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